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<title>CSS3核心模块</title>
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<body>
<h1 id="css3-">CSS3核心模块</h1>
<p><strong>过渡动画</strong></p>
<ul>
<li><code>transition</code>：过渡动画<ul>
<li><code>transition-property</code>：过渡属性 <code>all[attr]</code></li><li><code>transition-duration</code>：过渡时间</li><li><code>transition-delay</code>：延迟时间</li><li><code>transition-timing-function</code>：运行类型<ul>
<li><code>ease</code>：（逐渐变慢）默认值</li><li><code>linear</code>：匀速</li><li><code>ease-in</code>：加速</li><li><code>ease-out</code>：减速</li><li><code>cubic-bezier</code>：贝塞尔曲线</li></ul>
</li></ul>
</li></ul>
<p>过渡动画效果思考步骤：</p>
<ol>
<li>找到过渡属性</li><li>找到过渡属性起始值和结束值</li><li>在合适的位置上增加<code>transition</code>属性</li></ol>
<p><strong>2D变换</strong></p>
<ul>
<li><code>transform</code>：变形属性<ul>
<li><code>rotate()</code>：旋转函数<ul>
<li><code>deg</code>：度数</li><li><code>transform-origin</code>：旋转的基点</li></ul>
</li><li><code>skew()</code>：倾斜函数<ul>
<li><code>skewX()</code></li><li><code>skewY()</code></li></ul>
</li><li><code>scale()</code>：缩放函数 默认值是1<ul>
<li><code>scaleX()</code></li><li><code>scaleY()</code></li></ul>
</li><li><code>translate()</code>：位移函数<ul>
<li><code>translateX()</code></li><li><code>translateY()</code></li></ul>
</li></ul>
</li></ul>
<p><strong>animation-声明关键帧</strong></p>
<ul>
<li>关键帧——<code>@keyframes</code><ul>
<li>类似于<code>flash</code><ul>
<li>定义动画在每个阶段的样式，即帧动画</li></ul>
</li><li>关键帧的时间单位<ul>
<li>数字：<code>0%</code>、<code>25%</code>、<code>100%</code>等（设置某个时间段内任意时间点的样式）</li><li>字符：<code>from(0%)</code>、<code>to(100%)</code>：</li></ul>
</li><li>格式<ul>
<li><code>@keyframes</code>：动画名称</li><li><code>{动画状态}</code></li></ul>
</li></ul>
</li></ul>
<p><strong>animation-调用动画</strong></p>
<ul>
<li>必要属性<ul>
<li><code>animation-name</code>：动画名称（关键帧名称）</li><li><code>animation-duration</code>：动画执行时间</li></ul>
</li><li>可选属性：<ul>
<li><code>animation-timing-function</code><ul>
<li><code>linear</code>：匀速</li><li><code>ease</code>：缓冲</li><li><code>ease-in</code>：由慢到快</li><li><code>ease-out</code>：由快到慢</li><li><code>ease-in-out</code>：由慢到快再到慢</li><li><code>ease-bezier(num,num,num,num)</code>：特定的贝塞尔曲线类型，4个数值需在[0,1]区间内</li></ul>
</li><li><code>animation-delay</code>：动画延迟</li><li><code>animation-iteration-count</code>：重复次数</li><li><code>animation-direction</code>：动画运行的方向 <code>normal|reverse|alternate|alternate-reverse</code></li><li><code>animation-play-state</code>：动画状态 <code>running|paused</code></li><li><code>animation-fill-mode</code>：动画结束后的状态 <code>none|forwards|backwards|both</code></li></ul>
</li></ul>
<p><strong>3D变换</strong></p>
<ul>
<li><code>transform-style: flat|preserve-3d</code>：3D空间展示</li><li><code>perspective</code>：景深效果</li><li><code>transform: persective(800px)</code>：直接作用在子元素上</li><li><code>transform</code>：新增函数<ul>
<li><code>translate3d(tx, ty, tz)</code>：<code>translateX()</code> <code>translateY()</code> <code>translateZ()</code></li><li><code>rotate3d(rx, ry, rz, a)</code>：<code>rotateX()</code> <code>rotateY()</code> <code>rotateZ()</code></li><li><code>scale3d(sx, sy, sz)</code>：<code>sacleX()</code> <code>sacleY()</code> <code>sacleZ()</code></li></ul>
</li></ul>
<p><strong>圆角 border-radius</strong></p>
<ul>
<li><code>border-radius</code>：1-4个数字/1-4个数字<ul>
<li>水平半径/垂直半径</li><li>四个数字方向分别是<strong>左上 右上 右下 左下</strong></li><li>没有<code>/</code>则水平半径和垂直半径一样<ul>
<li><code>border-radius: 10px/5px;</code></li><li>border-radius: 60px 40px 30px 30px/30px 20px 10px 5px</li><li>例子：圆 椭圆 半圆 扇形</li></ul>
</li></ul>
</li></ul>
<p><strong>线性渐变 linear-gradient</strong></p>
<ul>
<li><code>linear-gradient</code>：（[&lt;起点&gt;||&lt;角度&gt;,]?&lt;点&gt;,&lt;点&gt;…）</li><li>只能用在背景上</li><li>颜色是沿着一条直线轴变化</li><li>参数<ul>
<li>起点：开始渐变方向</li><li>角度：开始渐变角度</li><li>点：渐变点的颜色和位置</li></ul>
</li><li>重复线性渐变</li></ul>
<p><strong>径向渐变 radial-gradient</strong></p>
<ul>
<li><code>radial-gradient</code></li><li>从“一点”向多个方向颜色渐变</li><li><code>shape</code>形状：<code>ellipse</code>、<code>circle</code>或设置水平半径，垂直半径</li><li><code>size</code>：渐变的大小，即渐变停止位置：<ul>
<li><code>closet-side</code>：最左边</li><li><code>farthest-side</code>：最远边</li><li><code>closet-corner</code>：最近角</li><li><code>farthest-corner</code>：最远角（默认值）</li></ul>
</li><li><code>position</code>：关键词|数值|百分比</li><li>重复的径向渐变</li></ul>
<p><strong>背景</strong></p>
<ul>
<li><code>background-origin</code><ul>
<li><code>padding-box</code>：从<code>padding</code>区域显示</li><li><code>border-box</code>：从<code>border</code>区域显示</li><li><code>content-box</code>：从<code>content</code>区域显示</li></ul>
</li><li><code>background-clip</code><ul>
<li><code>padding-box</code>：从<code>padding</code>区域向外裁剪</li><li><code>border- box</code>：从<code>border</code>区域向外裁剪</li><li><code>content-box</code>：从<code>content</code>区域向外裁剪</li><li><code>text</code>：文本裁剪</li></ul>
</li><li><code>background-size</code><ul>
<li><code>100% 100%</code>：百分比</li><li><code>10px 10px</code>：数值</li><li><code>contain</code>：按原始比例收缩，背景图显示完整，但不一定铺满整个容器</li><li><code>cover</code>：按原比例收缩，背景图可能显示不完整，但铺满整个容器</li></ul>
</li><li><code>background-attachment</code><ul>
<li>背景图片是滚动/固定 <code>fixed</code>(固定的) 默认是滚动的</li></ul>
</li></ul>
<p><strong>盒子阴影</strong></p>
<ul>
<li><code>box-shadow</code>：h v blur spread color inset;<ul>
<li><code>h</code>：水平方向偏移</li><li><code>v</code>：垂直方向偏移</li><li><code>blur</code>：模糊半径</li><li><code>spread</code>：扩展半径</li><li><code>color</code>：颜色</li><li><code>inset</code>：内阴影，默认是外阴影</li></ul>
</li></ul>
<p><strong>文本阴影</strong></p>
<ul>
<li><p><code>text-shadow</code>：x y blur color</p>
<ul>
<li><code>x</code>轴偏移 <code>y</code>轴偏移 模糊度 颜色</li><li>多层阴影制作文字立体效果，设置多种颜色，中间以逗号隔开</li></ul>
</li><li><p>文字添加边框</p>
<ul>
<li><code>text-stroke</code>：2px blue<ul>
<li>通过设定<code>1px</code>的透明边框，可以让文字变得平滑</li><li>颜色设成透明能够创建镂空字体</li></ul>
</li></ul>
</li></ul>
<p><strong>滤镜</strong></p>
<ul>
<li><code>-webkit-filter:normal;</code>：正常</li><li><code>-webkit-filter:grayscale(1);</code>：灰度，取值范围0-1</li><li><code>-webkit-filter:brightness(0);</code>：亮度，取值范围0-1</li><li><code>-webkit-filter:invert(1);</code>：反色，取值范围0-1，0为原图，1为彻底反色</li><li><code>-webkit-filter:sepia(0.5);</code>：叠加褐色，取值范围0-1</li><li><code>-webkit-filter:hue-rotate(30deg);</code>：色相（按照色相环旋转，顺时针方向）（红-橙-黄-黄绿-绿-蓝绿-蓝-蓝紫-紫-紫红-红）此处为叠加黄色滤镜</li><li><code>-webkit-filter:saturate(4);</code>：饱和度，取值范围0-*，0为无饱和度，1为原图，值越高，饱和度越大</li><li><code>-webkit-filter:contrast(2);</code>：对比度，取值范围0-*，0为无对比度（灰色），1为原图，值越高对比度越大</li><li><code>-webkit-filter:opacity(0.8);</code>：透明度，取值范围0-1，0为全透明，1为原图</li></ul>
<p><strong>遮罩</strong></p>
<ul>
<li><code>mask-image</code>：</li><li><code>mask-position</code>：</li><li><code>mask-repeat</code>：</li></ul>

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